Crawl Space Encapsulation Cost: What to Charge and Quote

Crawl space encapsulation is priced by square footage of the floor and walls, plus the condition of the space when you get there — standing water, existing mold, and access all move the number more than the barrier material itself.

What is a typical crawl space encapsulation cost?

Most residential crawl space encapsulation jobs land between $3,000 and $9,000, with full systems that include a sump pump and dehumidifier running $8,000 to $15,000. A small, dry, easy-access crawl space with just a heavy vapor barrier and taped seams can come in under $2,500.

How do you price it per square foot?

A common range is $3 to $7 per square foot for a standard 12- to 20-mil liner installed on the floor and up the walls, sealed at seams and penetrations. Add for wall foam board insulation, rim joist sealing, and encapsulating support columns. Measure the floor area and the wall linear footage separately — walls are labor-heavy relative to their square footage.

What add-ons change the quote?

• Sump pump and interior drain tile: $1,200–$3,500
• Crawl space dehumidifier: $1,500–$2,800 installed
• Mold remediation before lining: $500–$4,000 depending on extent
• Debris removal and old insulation tear-out: $300–$1,200
• Access door or vent sealing: $150–$600

What site conditions should you check before quoting?

Head clearance under 3 feet slows every task and should raise your labor rate. Standing water means you are quoting drainage first, encapsulation second. Look for active plumbing leaks, foundation cracks, and pest damage — call those out in the estimate as separate line items or exclusions so you are not blamed for them later.

How should the estimate be structured?

Break it into prep (cleanout, grading, mold treatment), the liner system (floor, walls, columns, seams), and moisture control (drainage, sump, dehumidifier). Homeowners compare encapsulation bids line by line, and a bid that bundles everything into one number usually loses to one that shows what is included.